Furnace or oven



H. B. CANNON.

FURNACE OR OVEN.

APPLICATION FILED MAR. 29, 1920.

1,371,774. v Patented Mar. 15, 1921.

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UNITED STATES EIRAIMI B. CANNON, OF PORT HURON, MICHIGAN.

FURNACE OB OVEN.

To all whom it may concern:

Be it known that I, HLRAM B. CANNON, a citizen of the United States, residingat Port Huron, in the county of St. Clair and State of Michigan have invented a certain new and useful lmprovement in Furnaces or Ovens, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to furnaces or ovens, and has for its general object to provide afurnace or oven wherein the heating of articles may be accomplished in a particularly eflicient manner. A further and more limited object of the invention is to provide a furnace of this character with a combustion chamber which is adapted to deliver to the article or articles to be heated a maximum proportion of the energy derived from the combustion of the fuel. I secure these and other objects, to be explained hereinafter, through the construction and arrangement of parts shown in the drawings forming a part hereof, wherein igure 1 represents a central vertical sectional view through such furnace, and Figs. 2 and 3 sectional views corresponding reipectively to the lines 22 and 3-3 of Describing the various parts by reference characters, 1 denotes the front wall, 2 the rear wall, 3 the side walls and 4 the bottom wall of a furnace which is shown as adapted to receive within the top thereof an elongated tank 5 in which metal, such as t1n,

may be maintained in a molten condition.

Beneath the top of the rear wall, the furnace chamber 6 isprovided with an opening 7 from which a flue 8 extends. The walls 14 inclusive may be of ordinary fire brick having a lining 8 of insulating brick.

The front wall of the furnace isprovided with an opening 9 in which thereis mounted an injector 10 by means of which gas, pulverized fuel, or oil ma be introduced into a combustion chamber, lndicated generally at 11-, within the chamber 6 and beneath the tank 5. This combustion chamber comprises a front wall 12, a rear wall13, a bottom wall 14, sidewalls and a top wall 16. Between the top and bottom walls and extending fromthe front wall nearly to the rear wall and between the side walls is a wall 17. This wall is preferably parallel with the top and bottom walls and is supported from the latter wall by means of posts 18. Beneath Specification of Letters Patent. Patented Ma 15 1921 Application filed March 29, 1920. Serial No.

7 I l the front end of the wall 17, the wall 12 is provided with an opening 19 throughwhich the lIlJGCtOI 10 may discharge into the chamber formed-by and between the walls 12, 14, 15, and 17. At a short distance rearwardly of the-opening 19, there is located a baflle 20, sa1d baflie belng preferably triangular in section and having one of its angular corners directed toward the opening 19 and extending between the walls 14 and 17 The bottom wall 14 is supported upon transversely extending blocks 21, and the wall 16 is provided with slots 22' progres= sively increasing in width from'the rear to the front thereof. 1

The parts 1218 inclusive and and 21 are preferably of crystallized carborundum mixed with a small percentage of binding material, such as fire clay, and molded to shape. After the molding operation, the said parts are dried thoroughlyand' subsequently heated toa temperature of about 3500 F. in order to re-crystallize the carborundum.

In operation, the fuel delivered into the combustion chamber beneath the plate 17 is ignited. The baffle 20 shortens the flame produced .by the burning of the combustible mixture confining the flame within the forward portion of the chamber provided below the plate 17. I have found that my carborundum combustion chamber is ex, tremely permeable .to heat from within and iscapabIe of radiating heat with extreme rapidity sothat, during the progress of the flame and products of combustion from the front to the rear end of the plate 17, a very high proportion of the heat produced by such combustion is; radiated by the walls =14, 15 and 17 The combustion chamber 11,

being supported within and spaced from the walls of the furnace chamber 6, heats in a most efiicient. manner the air circulating beneath the bottom and along the sides and ends ofthe combustion chamber. Wherethe escape of the products of combustion into the furnace chamber is not detrimental to the object or'objects.-rt'o'be i heated, the products may be allowed-to escape into the chamber through the slots 22. The progressive increase in the width of the slots from the rear wall 13 to the front wall 12 of the combustion chamber serves to equalize the temperature beneath the bottom of thetank 5, the hotter portions of the products of combustion being discharged in smaller quantities than the cooler porstren h which, moreover, is practically invaria 1e throughout all temperature ranges .up to within approximately its melting or decomposing point;

i 0. Its low coeflicient ofexpansion whereby it will not crack through sudden and excessive changes in temperature;

Having thus described my invention, What I claim is: t

1. A combustion chamber havin intermediate the top and bottom thereo a partition extending from the front of said chamber toward and spaced from the rear thereof, the top of said chamber being provided with an outletopening near the front, said chamber being] composed principally of carborundum, and means for supplying a combustible mixture into the front of said chamber and beneath said partition' 2. A combustion chamber having intermediate the top and bottom thereof a partition extending from the front of said chamber toward and spaced from the rear thereof, the top of said chamber being provided with outlet openings between the rear and the front thereof, said outlet openings increasing progressively in area from the rear toward the front, said chamber being composed principally of carborundum, and means for supplying a combustible mixture into the front of said chamber and beneath said partition.

3. A combustion chamber having intermediate the top and bottom thereof a partition extending from the front of said chamber toward andspaced from the rear thereof, the top of said chamber being provided with outlet openings between the rear and the front thereof, said outlet openings increasing progressively in area from the rear toward the front, and means for supplying a combustible mixture into the front of said chamber and beneath said partition.

4'. A combustion chamber'having intermediate the top and bottom thereof a partition extending from the front of said chamber toward and spaced from'the rear thereof, thetop of said chamber being provlded with outlet openings between the rear and the front thereof, saidoutlet openings increasing progressively in area from the rear toward the front, said chamber being composed principally. of. carborundum means for supplying a combustiblemixt'ure'" "-of, a combustion chamber supported on said into the front of said chamber andheneath said partition, there being a bafile in the front portion of said chamber interposed between the said partition and the bottom wall'of said chamber, said baflie being composed principally of carborundum.

5. A combustion chamber having intermediate the top and bottom thereof a partition extending from the front of said chamber toward and spaced from the rear thereof, the top of said chamber being provided with an outlet opening near the front thereof, means for supplying a combustible mixture into the front of said chamber and beneath said partition,there being a baffle in the said chamber and interposed'between' the said partition and the bottom wall of said chamber.

' 6. A combustion chamber comprising top, bottom and front and rear walls, apartition intermediate the top and bottom walls and extending from the front wall toward the rear wall and having its rear end spaced from the latter wall, the top wall being provided with outlet openings increasing progress'ively in area from the rear toward the front wall, blocks supporting the said partition from the bottom wall, a baflie of triangular section interposed between the par tition and bottom wall and adjacent to the front end of said chamber, supports for the bottom wall, said combustion chamber, blocks, baflie and supports being composed principally of carborundum, and means for I supplying a combustible mixture through the front wall and into thespace between the said partition and the bottom wall.

7. A combustion chamber comprising top, bottom and front and rear walls, a partition intermediate the top and bottom walls and extending from the front wall toward the rear wall and havin its rear end spaced from the latter wall, t e top wallbeing provided with an outlet opening, a bafile of triangular section interposed between the par-' tition and bottom wall vand adjacent to the front end of said chamber, and means for supplying acombustible mixture through the front wall and into the space between the said partition and the bottom wall.

8..Afurnace or oven comprising a chamber, and a combustion chamber within the furnace or oven chamber and spaced from the bottom, ends and sides of the first mentioned chamber, the combustion chamber be ing composed principally of carborundum.

9, A furnace or oven comprising a chamber, and acombustionchamber within the furnace or oven chamber, the combustion chamber being composed principally of carborundum.

10. 'A furnace or oven comprising a chamber, blocks extending transversely of said chamber and supported .on the bottom there side walls of the furnace or oven chamber, said combustion chamber and blocks being composed principally of carborundum, and

means for supplying a combustible mixture to one end of said combustion chamber.

11. A furnace or oven comprising a chamber, blocks extending transversely of said chamber and supported on the bottom wall thereof, a combustion chamber supported on said blocks and spaced from the sides and ends of the first mentioned chamber, said combustion chamber comprising a top, bottom, and front and rear ends, a partition interposed between the top and bottom of the combustion chamber and extending from the front w 11 toward and spaced at its rear end 'from t e rear wall of said combustion bustion chamber a combustible mixture, the said combustion chamber and the supports and baffle being composed principally of carborundum.

-12. A combustion chamber for heating by radiation composed principally of carborundum, and means for heating the same interiorly.

13. A combustion chamber for heating by radiation ,compo'sed principally of carborundum, 'bustible ber.

, 14. A combustion chamber having intermediate the top and bottom thereof a partition extending from the front of said chamber toward and'spaced from the rear thereof, the said chamber having in the front thereof and below said partition an inlet for a combustible mixture, and a baflle at the rear mixture into one end of said chamof said inlet and between the partition and the bottom of said chamber, said chamber being composed principally of carborundum. In testimony whereof, I hereunto alfix my signature.

HIRAM B. CANNON.

and means for introducing a com- 

